60 Watt Doherty amplifiers using high gain 2-stage hybrid amplifier modules

Author

Crescenzi, E. James, Jr. ; Pengelly, Raymond S. ; Wood, Simon M. ; Buss, Robert E.

Author_Institution

Cree Microwave Corp., Sunnyvale, CA, USA

fYear

2005

fDate

12-17 June 2005

Abstract

A Doherty amplifier has been constructed using small surface-mount 2-stage 30 W hybrid amplifier modules. These modules offer higher gain and simpler matching than do discrete transistors. This 26 dB gain Doherty amplifier uses a conventional 2-way topology, with class AB "main" branch and class C "peaking" branch output stages. A 3GPP 2-WCDMA signal output level of 10 Watts is achieved with 26.4% efficiency and < -40 dBc ACLR and -38 dBc IM3s. When augmented by pre-distortion, 12.5 Watts of 2-WCDMA signal output is produced with < -51 dBc ACLR and -54 dBc IM3s, with 26.8 % efficiency.

Keywords

hybrid integrated circuits; intermodulation distortion; microwave integrated circuits; microwave power amplifiers; surface mount technology; 10 W; 12.5 W; 2-stage hybrid amplifier modules; 2-way topology; 26 dB; 30 W; 3GPP 2-WCDMA signal; 60 W; Doherty amplifiers; class AB main branch; class C peaking branch; hybrid integrated circuits; intermodulation distortion; microwave power amplifier; surface-mount amplifier modules; Copper; Electromagnetic heating; Gain; Microwave amplifiers; Microwave devices; Microwave transistors; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Thick film circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2005 IEEE MTT-S International

ISSN

01490-645X

Print_ISBN

0-7803-8845-3

Type

conf

DOI

10.1109/MWSYM.2005.1516941

Filename

1516941